Journal
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
Volume 123, Issue 5, Pages -Publisher
SPRINGER
DOI: 10.1007/s00339-017-0997-z
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Funding
- National Nature Science Foundation of China [51202276]
- Nature Science Foundation of Shanghai [14520710400]
- Open Fund of the State Key Laboratory of Crystal Material [KF1305]
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Cerium-doped 1% Ce:Gd2Y1Ga2.7Al2.3O12(GYGAG) single crystal samples grown via Czochralski method were annealed under air, O-2 and N-2 atmospheres from 350 to 1400 degrees C. The X-ray excited luminescence spectra, energy spectra and UV as well as thermally stimulated luminescence (TSL) spectra were performed comparatively on as-grown'' and thermally annealed samples. It was found that the luminescence efficiency after annealing in air and O-2 was significantly enhanced compared to the non-annealed samples and this phenomenon was suggested to be caused by the existence of some oxygen vacancies in the Ce: GYGAG crystals. And the oxygen vacancies in the as-grown GYGAG crystals can be effectively eliminated by means of annealing in O-2 containing atmosphere without changing the luminescence mechanism. From the TSL curves before and after annealing, three traps within 77-650 K were found to be related to oxygen vacancies.
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